In what scenarios should the urldecode() function be used in PHP scripts to handle encoded data passed through links?

When data is passed through links in PHP scripts, it is often encoded to ensure special characters are properly handled. To handle this encoded data, the urldecode() function should be used to decode the data before processing it. This function is especially useful when retrieving values from query parameters in URLs.

// Example of using urldecode() to handle encoded data passed through links
$encoded_data = $_GET['data']; // Retrieving encoded data from URL parameter
$decoded_data = urldecode($encoded_data); // Decoding the data
// Now $decoded_data can be safely used in the script